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Intangible Assets | 12 Months Ended
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Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 9. Intangible Assets Intangible assets consist of the following (in thousands):
|  |  |  | September 30, 2019 |  |  | September 30, 2018 |
|  | Useful Life |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Customer lists |  | 6-10 years |  | $ | 1,219 |  |  | $ | (948 | ) |  | $ | 271 |  |  | $ | 1,219 |  |  | $ | (745 | ) |  | $ | 474 |
Trade names |  | 10-15 Years |  |  | 869 |  |  |  | (270 | ) |  |  | 599 |  |  |  | 869 |  |  |  | (213 | ) |  |  | 656 |
|  |  |  | $ | 2,088 |  |  | $ | (1,218 | ) |  | $ | 870 |  |  | $ | 2,088 |  |  | $ | (958 | ) |  | $ | 1,130 |
In 2018, we conducted our periodic assessment of long-lived assets and identified the need for an intangible asset impairment charge in our Solar segment of $1.3 million due primarily to the decline in our expected performance of that segment. All remaining intangible assets are included in our Semiconductor segment. During 2019, we periodically assessed whether any indicators of impairment existed related to our intangible assets. As of each interim period end during the year, we concluded that a triggering event had not occurred that would more likely than not reduce the fair value of intangible assets below their carrying value. Amortization expense related to intangible assets at our continuing operations was $0.3 million, $(20,000) and $0.6 million in 2019, 2018 and 2017, respectively. The credit in 2018 was due to a one-time correction of previously recorded amortization expense. Future amortization expense for the remaining unamortized balance as of September 30, 2019, is estimated as follows:
Years Ending September 30, |  | Amortization Expense |
2020 |  | $ | 261 |
2021 |  |  | 126 |
2022 |  |  | 58 |
2023 |  |  | 58 |
2024 |  |  | 58 |
Thereafter |  |  | 309 |
Total |  | $ | 870 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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